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Brown Canker

Cryptosporella umbrina (anamorph: Diaporthe umbrina)

8 host plants

Last updated

Data Coverage 3 of 6 dimensions
Causal Agent
Host Plants
Symptoms
Management
GDD Threshold
Regional Notes

Brown canker produces dark, sunken lesions on tree bark and branches. You see reddish-brown staining and oozing or gummosis in affected areas. The disease favors wet conditions and damaged trees, entering through wounds. Prune out infected wood and maintain tree health through proper care and irrigation.

Prune canes with a sharp knife or pruner immediately above a node when first symptoms are noticed. Remove and destroy canes before sporulation occurs.

Quick Reference

Causal Agent
Cryptosporella umbrina (anamorph: Diaporthe umbrina)
Host Plants
8
Favorable Conditions
High humidity; overhead irrigation; cool temperatures above 60°F; dense canop...

Management

What Triggers Infection

High humidity; overhead irrigation; cool temperatures above 60°F; dense canopies reducing air circulation; winter conditions with leaf wetness

Cultural Controls

  • Prune canes with a sharp knife or pruner immediately above a node when first symptoms are noticed.
  • Remove and destroy canes before sporulation occurs.
  • Use a winter protecting mulch that does not hold much water such as sand, rock pumice, or coarse bark.

Host Plants (8)